Php Extension Serial Port

Posted By admin On 01.02.20

Read serial port with PHP is so simple in Linux machine for windows will write another article soon. How to install OCI8 extension for PHP Oracle development. I am looking for a way to communicate with RS232 serial COM port on windows. Serial comm with PHP on Windows. Writing my own php extension when I came across.

The PHP extension for communicate other device via serial-port(COM).
This module is able to run on POSIX system and Windows.
You are able to talk to microcontroller(e.g. Arduino, AVR or PIC, etc) with PHP, if you use this extension.

シリアルポート(COM)を介して他のデバイスと通信を行うための PHP 拡張です。
このモジュールは Linux などの POSIX システムと Windows で動作します。
Gorilla を用いれば PHP で Arduino や AVR, PIC といったマイクロコントローラと通信ができます。

This is a standalone PHP extension created using CodeGen_PECL 1.1.3

To compile your new extension, you will have to execute the following steps:

  1. $ ./phpize
  2. $ ./configure [--enable-Gorilla]
  3. $ make
  4. $ make test
  5. $ [sudo] make install

Building PHP extension for Windows is more hard than UNIX like platform.
There are some binaries for Windows.
http://sandbox.n-3.so/Gorilla/downloads/

These zip files are named with next rule.
Gorilla-[version of Gorilla]-[version of PHP]-[ts or nts]-[architecture].zip

DLL features (PHP version, TS or NTS and architecture) must be matched php.exe's.
TS means Thread Safe, and NTS means Non Thread Safe. Architecture may be x86 or x64.
For example, Gorilla-0.5.0-5.5-ts-x86.zip includes DLL for php.exe which is,

  • version 5.5.x
  • thread safe
  • 32bit(x86)

Install DLL

Follow next step to enable Gorilla.

  1. save php_Gorilla.dll into your extension_dir.
  2. add extension=php_Gorilla.dll to your php.ini

Please confirm extension_dir directive in php.ini.

Run next command, to make sure that installation has succeeded.

Power Port

Or run phpinfo() script,

You can see information about this extension.

You can now load the extension using a php.ini directive

or load it at runtime using the dl() function

The extension should now be available, you can test thisusing the extension_loaded() function:

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The extension will also add its own block to the outputof phpinfo();

There are two ways to modify an extension created using CodeGen_PECL:

  1. you can modify the generated code as with any other PHP extension

  2. you can add custom code to the CodeGen_PECL XML source and re-run pecl-gen

The 2nd approach may look a bit complicated but you have be aware that anymanual changes to the generated code will be lost if you ever change theXML specs and re-run PECL-Gen. All changes done before have to be appliedto the newly generated code again.Adding code snippets to the XML source itself on the other hand may be abit more complicated but this way your custom code will always be in thegenerated code no matter how often you rerun CodeGen_PECL.

PHP Serial was written at a time where I did not know any other language thanPHP and I started to get seriously bored with its abilities.

I somehow got hold of a « Citizen C2202-PD » point-of-sale display, and I wantedto play around with it. I also managed to get the documentation of it, andcreated a convenience class to access the serial port though the Linux file.

Afterwards, I posted it to PHP Classes,and this probably is what brought it any visibility.

Example

State of the project

Interestingly enough, this piece of code that is widely untested has created alot if interest ever since it was created, and especially nowadays witheverybody toying around with Arduinos and Raspberry Pis. I receive about 1 emailevery month asking for help with the code or sending patches/suggestions.

I think that it is time for me to remove the dust off this project and to giveit a full visibility on modern tools, aka GitHub.

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Bugs

There is lots of bugs. I know there is. I just don't know which are they.

Platform support

Serial Port To Usb Port Adapter

  • Linux: the initially supported platform, the one I used. Probably the lessbuggy one.
  • MacOS: although I never tried it on MacOS, it is similar to Linux and somepatches were submitted to me, so I guess it is OK
  • Windows: it seems to be working for some people, not working for someothers. Theoretically there should be a way to get it done.

Concerns

I have a few concerns regarding the behaviour of this code.

  • Inter-platform consistency. I seriously doubt that all operations go the sameway across all platforms.
  • Read operations. Reading was never needed in my project, so all the tests Idid on that matter were theoretic. I was also quite naive, so the API isprobably not optimal. What we need is to re-think reading from scratch.
  • Configuration done by calling functions. This is so Java. It would be muchbetter to be able to pass a configuration array once and for all. Furthermore,I suspect that the order of call matters, which is bad.
  • Auto-closing the device. There is an auto-close function that is registeredat PHP shutdown. This sounds quite ridiculous, something has to be done aboutthat.
  • Use exceptions. Currently there is an heavy use of the errors system to reporterrors (2007 baby), but this is seriously lame. They have to be replaced byactual exceptions.

Call for contribution

I have about 0 time to code or test this project. However, there is clearly aneed for it.

As in all open-source projects, I need people to fit this to their needs and tocontribute back their code.

What is needed, IMHO:

  • Address the concerns listed above, and find new ones.
  • Create a reproducible test environment for each OS, and prove that eachfeature works (basically, unit-testing).
  • Report of use cases, bugs, missing features, etc.

If you feel like doing any of those, do not hesitate to create an issue or apull-request, I'll gladly consider consider it :)

Licence

PHP SerialCopyright (C) 2007-2014 PHP Serial's contributors (see CONTRIBUTORS file)

This program is free software; you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation; either version 2 of the License, or(at your option) any later version.

This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU General Public License for more details.

Parallel Port

You should have received a copy of the GNU General Public License alongwith this program; if not, write to the Free Software Foundation, Inc.,51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.